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path: root/src/devices/bus/amiga/zorro/a2058.cpp
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// license:GPL-2.0+
// copyright-holders:Dirk Best
/***************************************************************************

    Commodore A2058

    Zorro-II RAM Expansion (2, 4 or 8 MB)

***************************************************************************/

#include "emu.h"
#include "a2058.h"


//**************************************************************************
//  CONSTANTS / MACROS
//**************************************************************************

#define VERBOSE 1


//**************************************************************************
//  DEVICE DEFINITIONS
//**************************************************************************

DEFINE_DEVICE_TYPE(A2058, a2058_device, "a2058", "CBM A2058 Fast Memory")

//-------------------------------------------------
//  input_ports - device-specific input ports
//-------------------------------------------------

static INPUT_PORTS_START( a2058 )
	PORT_START("config")
	PORT_CONFNAME(0x03, 0x02, "A2058 Installed RAM")
	PORT_CONFSETTING(0x00, "2 MB")
	PORT_CONFSETTING(0x01, "4 MB")
	PORT_CONFSETTING(0x02, "8 MB")
	PORT_CONFSETTING(0x03, "Auto-Config disabled")
INPUT_PORTS_END

ioport_constructor a2058_device::device_input_ports() const
{
	return INPUT_PORTS_NAME( a2058 );
}


//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  a2058_device - constructor
//-------------------------------------------------

a2058_device::a2058_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, A2058, tag, owner, clock),
	device_zorro2_card_interface(mconfig, *this),
	m_config(*this, "config"),
	m_ram_size(0)
{
}

//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void a2058_device::device_start()
{
	// setup ram
	m_ram = make_unique_clear<uint16_t[]>(0x800000/2);

	// register for save states
	save_pointer(NAME(m_ram), 0x800000/2);

	set_zorro_device();
}


//**************************************************************************
//  IMPLEMENTATION
//**************************************************************************

void a2058_device::autoconfig_base_address(offs_t address)
{
	if (VERBOSE)
		logerror("%s('%s'): autoconfig_base_address received: 0x%06x\n", shortname(), basetag(), address);

	if (VERBOSE)
		logerror("-> installing a2058\n");

	// stop responding to default autoconfig
	m_slot->space().unmap_readwrite(0xe80000, 0xe8007f);

	// install access to the rom space
	m_slot->space().install_ram(address, address + (m_ram_size << 20) - 1, m_ram.get());

	// we're done
	m_slot->cfgout_w(0);
}

WRITE_LINE_MEMBER( a2058_device::cfgin_w )
{
	if (VERBOSE)
		logerror("%s('%s'): configin_w (%d)\n", shortname(), basetag(), state);

	if (state == 0)
	{
		// setup autoconfig
		autoconfig_board_type(BOARD_TYPE_ZORRO2);

		// setup ram
		switch (m_config->read())
		{
		case 0:
			autoconfig_board_size(BOARD_SIZE_2M);
			m_ram_size = 0x200000 >> 20;
			break;
		case 1:
			autoconfig_board_size(BOARD_SIZE_4M);
			m_ram_size = 0x400000 >> 20;
			break;
		case 2:
			autoconfig_board_size(BOARD_SIZE_8M);
			m_ram_size = 0x800000 >> 20;
			break;
		case 3:
			// auto-config disabled
			m_ram_size = 0;
			return;
		}

		autoconfig_product(0x0a);
		autoconfig_manufacturer(0x0202);
		autoconfig_serial(0x00000000);

		autoconfig_link_into_memory(true);
		autoconfig_rom_vector_valid(false);
		autoconfig_multi_device(false);
		autoconfig_8meg_preferred(false);
		autoconfig_can_shutup(true); // ?

		// install autoconfig handler
		m_slot->space().install_readwrite_handler(0xe80000, 0xe8007f,
				read16_delegate(*this, FUNC(amiga_autoconfig::autoconfig_read)),
				write16_delegate(*this, FUNC(amiga_autoconfig::autoconfig_write)), 0xffff);
	}
}